Apple announced a slightly refreshed line up of all its notebooks today at its World Wide Developer Conference.

The major change in the notebooks is a newer battery with a 40% more battery life, more memory and processing power along with a cheaper price tag.

Most notebooks got a slight bump in their specs, along with a minor redesign for the 15" MacBook Pro, which can now go as far as Intel Core 2 Duo 3.06 GHz processor with 6MB of L2 cache, and 8GB of DDR3 1066 MHz memory. You can also take the hard-drive up to a 500 GB or opt in for a 256GB SSD. A new introduction is a non-removable battery with over 40% more life and an SD Card slot. The base version retails for $1699.

The 13" MacBook just got upgraded to a 13" MacBook Pro, with the newer 7 hour long battery, SD Card slot, and a maximum of 8GB RAM. The Firewire 800 port also returns here, and the base version retails for $1199.

The MacBook Air also saw a refresh, with the high end version getting a price cut of $700 to $1599 with a 256GB SSD. The 17" MacBook Pro got a price decrease to $2499, with no other major alterations, like a 2.8 GHz C2D and 4 GB of RAM.

All the notebooks get a greener body and battery with a display supposedly providing 60% more color gamut. If you already own one of the new notebooks revealed in late 2008, then you probably shouldn't upgrade. For others, if you are Mac Savvy, then this is your cue.